The Fail Zero Full Auto Rated Lightweight bolt carrier group comes fully assembled and ready to drop into most mil-spec AR-15 upper receivers (brand part no. FZ-FULL-AUTO-LW-NH). All critical parts carry the EXO nickel boron coating, which gives permanent dry lubricity, strong wear resistance and corrosion resistance. The low-mass design is rated by Fail Zero for full auto use and works with 5.56, .223 and 300 Blackout rifles. It is a good choice for hard-run range rifles, training guns and builds where a slick, easy-to-clean bolt carrier group matters.

Key Specifications

• The part is a complete bolt carrier group that is fully assembled and ready to install.
• It is made for mil-spec AR-15 upper receivers.
• The design is lightweight (low mass), with a total weight of 9.6 ounces.
• It is compatible with 5.56, .223 and 300 Blackout.
• All critical parts are coated in EXO nickel boron, a treatment known for slick, easy-to-clean surfaces.
• The coating provides permanent dry lubricity, which cuts friction without relying on heavy oil.
• The coating also adds extreme durability and corrosion resistance, which helps the group last under hard use.

Frequently Asked Questions

Which rifles does this bolt carrier group fit? Fail Zero states it drops into most mil-spec AR-15 upper receivers and is compatible with 5.56, .223 and 300 Blackout.

How heavy is it? The complete group weighs 9.6 ounces, because it uses a lightweight, low-mass design.

Buy the Fail Zero Full Auto Rated Lightweight Bolt Carrier Group, Nickel Boron, 5.56mm

Fail Zero builds this lightweight group with a nickel boron coating on every critical part to cut friction and resist wear. Order it from our Lubbock, Texas gun shop for fast direct shipping, and see more AR bolt carrier groups while you are here.